Combustion apparatus



Patented Aug. 22, "1933 i PATENT OFFICE COMBUSTION APPARATUS Cliford S. Cody, Sharon Hil1Pa., assignor to Westinghouse Electric &` Manufacturing Company, a Corporation of Pennsylvania Application March 11, 1932. Serial No. 598254 2 oaims. .(o. 110-471 Iviy invention relates to combustion apparatus and more particularly to improvements in watersupply and protecting castings used in conjunction with the walls of refuse and ash pits of stoker-fired furnaoes. v

In the copending application of Robert A. Foresman, serial No. %8329, filed November 29, 1930 and assigned to the Westinghouse Electric and Manufacturing Company, there is described and claimed a cast metal box-like structure which rests upon the upper surface of the front wall of a clinker pit and serves both as a bearing support for the lower end of a stoker grate and as a protection for the upper face of the pit wall. The cast metal structure is provided with a chamber in the interior thereof, into which water from an exterior source is conducted. Openings are provided at the clinker pit side of the structure and provide for the flow of water out oi" the chamber and onto the inne:

surface of the clinker pit wall. The present application is in the nature of an improvement over the structure disclosed and-claimed in the aboveidentified application of Foresman.

It is an object of this invention to provide apparatus of the character set forth which is improved in Construction, is simple, can he manufactured at a low cost, `and one which-is extremely durable.

A further object is to provide a removable cover plate for this type of structure which is at all times positively cooled.

According to a preferred embodiment of my. invention, I attain the above objects by providing a holiow cast metal cap which rests upon the upper surface of a clinker pit wall and includes a bottom wall having ribs formed therein which define Channels extending transversely of the ciinker pit wall; and a front wall having an opening therein adapted to receive a water supply means. The cap includes further a rear wall, the lower end of which defines, in conjunction with the rear end of the bottom wall, an opening extending transverseiy of the cap for permitting water to flow out of the cap and onto the inner face of the clinl er pit wall; side Walls joining the front and rear walls; and a top wall inclined downwardly and providing a hearing surface for the lower end of a progressive feed stoker grate; at least the rear portion of the top wall and the front wall being in the form of a removable piece' having ribs formed on the under side thereof which define Channels extending transversely of the clinker pit wall.

Water'is' admitted to the interior of the cap in the form of a spray which serves to maintain the inner surface of the metal in a cool condition, and hence protect the metal from the heat. Thorough distribution of the water over the in ner surfaces of the cap is insured by the ribs on thebottom wall and those on the' top and rear walls. The water fiows out of the ende' of the grooves and onto the front face of the clinlrer pit wall in an even sheet, thereby insuring the protection of such face. Also, as the rear portion of the top wall and the front wall are in the form of a removable piece, I provide for the ready replacement of those portions of the structure which are most suhjected to the hoat of the r resting on such wall and supporting the lower y end of the grate; u

Fig. 2 is a detail view illustrating in elevation the rear face of my improved cap-structure;

Fig. 3 is a transverse sectional View on the line III- III of Fig. 4 and showing my improvement with the coverremoved; e

Fig. 4 is a View similar to Fig. 2 with'the cover removed; e

Fig. 5 is an end elevation of thecover; and,

'Fig. 6 is a bottom plan of the cover shown in Fig. 5.

Referring now in detail to the Construction illustrated in the` accompanying drawing, the reference numeral 10 'indicates the lower portion of a movable overfeed grate section of a progressive feed stoker of the type disclosed in the application of Foresman No. 498329 referred to above. The reference numeral 11 indicates the upper end of the front wall of a clinker pit also illustrated in the application of Foresman aforementioned.

Resting on the upper face of the front wall 11 is a hollow cast metal cap structure 12'which v comprises a bottom wall 13 engaging the. pit wall; a front wa11 14 having an opening 15 formed 'therein through which 'extends a water supply pipe 16; a rear wall 17 terminating short 'of the bottom wall 13 to provide an opening 18, through which water ows onto the inner face19 of the clinker pit wall 11; side walls 20 and 21 joining the front and rear walls; and a wall 22 providing both a top for the cap and a bearing surface for the lower end of the overfeed grate 10.

The rear portion of the top wall 22 and the rear wall 17 is in the form of a removable piece 23 which is detachably secured to the remaining portions of the top wali 22. The sides of the piece 23 overlap and rest on theupper and rear edges of the side wails 20 and 21; The piece 23 is provided at the upper end thereof with spaced lugs 24 which fit within openngs 25 formed in the top wall 22 and serve to maintain the piece in place on the cap. Lugs 26 and 27 extend inwardly from the side walls 20 and 21, respectively, and removable pins 28 and 29 fitting within openings 30 and 31 formed in' the removable piece, extend behind the lugs 26 and' lifted by the rear end and rotated in a counterclockwisedirection as viewed in Fig. 1 until the ,iugs 24 are disengaged from the openings 25,

and then the piece may be bodiiy lifted out. To replace the piece, the reverse procedure is'followed.

A nozzle 32 is Secured to the inner end of the pipe 16 and serves to provide for the emission of waterin the form of a spray which strikes and keeps cool the under face of the top wall 22 and rear wall 17.

The upper surface of the bottom wall 13 is provided with ribs 33 which define channels 34 extending from the front wall 14 towards the rear wall 17 and transverseiy of the pit wall 11 for insuring the distribution `of water over the bottom wall and for directing the flow of such water onto the pit wall. `A depending fiange'35 is provided at the rear edge of the bottom wall and fits within a recess 36 in the pit wall 11. The ribs 33and Channels 34 are continued onto the exposed face of the fiange 35.

The ribs 33 provide for the proper distribution of the water even though the casting may not be in a horizontal position. For example, should there be no ribs and the casting tilted, the water from the spray would tend to flow iaterally along the bottom wall 13 to the lowermost side thereof and from there onto the front faceof the wall 11. The channeis prevent this action by preventing the flow of water from the spray in any direction except toward the clinker pit, thereby assuring the distribution of the water and maintenance of the casting in a cool condition.

The underside of the removable piece 23 is provided with ribs 38 and 39, the ribs 38 being continuations of the lugs 24. The ribs 38 and 39 extend in the same general direction as the ribs 33 and define channels 40 for insuring the distribution of water over the inner surfaces and thereby provide for the positive cooling thereof and for directing the water onto the front face of the'ciinker pit wall; Water emitting from the spray nozzie necessarily strikes the underside of the piece 23 at`ang1es, and obviously thorough distribution could not be had were it not for the channels defined by the ribs.

Frorn the above, it will be easily understood that I have provided a cap structure for the front Wall'of refuse pitswhich provides for the thorough distribution of water onto the front wall of theclinker pit and for the positive cooling of those portions thereof which are subjected to the heat of the fire.`

While I have shown my invention in but one form, it will be obvious to those skilied in the art that it is not so limited, but is susceptibie of various changes and modifications, without departing from the spirit thereof, and I desire, therefore, that only such iimitations shall be placed thereupon are imposed by the prior art or as are specicaliy set forth in the appended claims.

WhatI claim is:

1. The comhination with a refuse pit wall, of a hollow cast-metal cap for protecting such wall and for supplying a covering of cooling water to the inner face thereof and comprising a bottom wall resting on the refuse pit wall; a front wall; a rear wall terminating short of the bottom wall to define an opening extending for the width of the cap; side walls connecting the front and rear walls; a top wall providing a covering for the cap; the bottom wall having ribs provided on the upper face thereof and defining channels extending from the front wall to the rear Wall of the cap; and means providing for the admission of water to the interiorof the cap.

2. The combination with a movable grate structure and a refuse pit wall, of a hoilow castmetal cap supported upon the top surface of the pit wall and providing a hearing support for at least portions of the movable grate; the cap further providing for thesupplyof cooling water to the inner face of the pit wall and comprising a bottom wall resting on the refuse pit wall; a

front wall; side walls; a rear wall; ;and a top wall; at least the rear portion of the top wall and the rear wall being in the form of a detachable piece terminating 'short of the bottom wall to provide an opening extending transversely of the cap; the under surface of said detachable piece beingiprovided with ribs defining Channels extending in a direction transverse to the wall of' the refuse pit; and means providing for the admission of water to the interier of the cap.

- CLIFFORD S. CODY. 

